Which sampling technique divides the population by some factor?

The effects of epinephrine secretion during stress include all of the following EXCEPT:

A) increased heart rate. B) pupil dilation. C) vasodilation. D) sweaty palms.

Radiation-induced cataracts in humans follow a ______ dose–response relationship.

a. nonthreshold, nonlinear b. nonthreshold, linear c. threshold, linear d. threshold, nonlinear